Writing instrument



FIG. 1 is a top, side and back perspective view of one embodiment of the present invention;

FIG. 2 is a front view of the embodiment of FIG. 1;

FIG. 3 is a side view of the embodiment of the FIG. 1;

FIG. 4 is a bottom view of the embodiment of FIG. 1; and,

FIG. 5 is a top, side, back view of a second embodiment of the present invention. 

The ornamental design for a writing instrument, as shown and described. 